Method of treating refractory ores.



No. 660,!73. Patented Oct. 23, I900. J. C. TELLER.

METHOD OF TREATING REFRACTORY DBES.

(Application filed Sept. 28, 1899.)

(No Model.)

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UNITE STATES .PATENT OFFICE,

JOHN C. TELLER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE MINNESOTA ORE REDUCTION COMPANY, OF SAME PLACE.

METHOD OF TREATING REFRACTORY ORES.

SPECIFICATION forming part of Letters Patent No. 660,173, dated October 23, 1900.

Original application filed July 22,1898, Serial No. 686,566. Divided and this application filed September 28, 1899 Serial No. 731,909. (No specimens.)

To all whom it may concern:

Be it known that I, JOHN C. TELLER, acitizen of the United States, residing at Minneapolis, in the county ofHennepin and State of Minnesota, have invented an Improved Method 'of Treating'Refractory Ores; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My present invention relates to the treatment of refractory ores, and has for its object to provide an improved method whereby improved results are obtained.

The invention will be hereinafter described, and defined in the claim; and in the explanations of my improved method I will illustrate, briefly, an apparatus by the use of which the method may be readily put into effect in the treatment of refractory ores; I

This application is filed as a division of my pending application, Serial No. 686,566, filed July 22, 1898, and entitled ore-roasting furnace.

The apparatus illustrated in the single View of the drawing is shown in transverse vertical section and is of the type described and claimed in my above-identified application,

Referring briefly to the parts of the apparatus, the numeral 1 indicates a rotary drum provided on its interior with a lining of firebrick, the sections 2 of which provide the drum with a corrugated or stopped interior surface. Near its ends the drum 1 is provided with a pair of annular flanges or hoops 3, and at its intermediate portion it is provided with an annular worm-gear 4. This drum, as shown, is mounted as follows:

5 indicates the floor of a building or struc-' ture, on which a frame 6 is mounted.

7 indicates flanged guide-wheels which are mounted in bearing-brackets 8 on the frame 6 and on wheels which the annular flanges or hoops 3 of the drum 1 run on. A shaft 9,

mounted in suitable bearings 10 on the frame 6, is provided with a worm or screw 11, which. meshes with the annular worm-gear 4 on the drum 1. At its outer end said shaft 9 is provided with apulley 12, over which a powerdriven belt (not shown) is run to impart motion to the drum 1 in the direction indicated by the arrows marked thereon.

An oxidized-gas flame is delivered at the proper point within the drum, the products of combustion (preferably gas and air) being delivered through concentric supply-pipes 13 and 14, which terminate, respectively, in concentric twyers 15 and 16. r

z indicates a body of finely divided or pulverized ore, and 2 indicates loose orflying particles of the same, which particles are separated from the body or mass 2.

My improved method of treating the ore consists in applying flames to flying or loosened particles of the ore, which particles are projected from a mass of ore while said mass is in motion. This method will be more quickly understood by consideration of the action of the apparatus illustrated for carrying out the said method. Under the rotation of the drum the body or mass of pulverized ore within the drum will be carried upward in the direction of the rotation of the drum, and if the drum be driven at the proper speed the mass of ore will be carried upward to a point above a horizontal line intersecting or approximately intersecting the axis of the drum. Otherwise stated, the drum should be so speeded that under centrifugal motion the ore will not commence to roll backward under the action of gravity until the upper portion of the mass has been car ried sufficiently far above the level of the bu rner-tips to cause the particles to loosen up and fly from the mass and fall down through the flames from the burners. Otherwise stated, the flames are applied to the flying or loosened particles of the ore which are projected from the mass thereof at the turnover when the force of gravity begins to exceed the force of the centrifugal motionor other force tending to cause the particles of the mass to remain in bulk close to the interior of the drum. Still otherwise stated, the flames project through the loosened particles at or just below the overturn orroll-back of the stock. Hence the flames act upon the particles in a loosened-up or flying condition as they are projected from the mass of the stock under the cooperation of gravity and centrifusive portions of the ore to be carried upward past the horizontal plane, passingthrough the axis of the shell, whence they fall in a free shower of separate particles, and projecting a flame through the falling particles, substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

JOHN C. TELLER.

Witnesses:

F. O. BUTTERFIELD, R. D. MoELRoY. 

